Speak for yourself, all of us are not proud of US war crimes and serial violations of intl law. We are laughed at all over the world when our leaders talk about Morality. No nation has violated more intl laws or started more unlawful wars or killed more innocent civilians then we have.
You aren't grasping some pretty important concepts as we go into a perilous situation.
1. There are no international laws, because there is no international enforcement. There is no law of ANY kind without enforcement, and that includes the Ten Commandments. If God isn't going to enforce them, people are going to break them, and how they do.
2. People who are powerless tell you there are laws, but these are just paper laws without enforcement, and they mean nothing, nothing at all.
3. You say no country has started more unlawful wars than the USA. That's nonsense: what about Germany? WWI and WWII. What about Japan and the Rape of Nanking and the attack on Pearl Harbor and the occupation of the Philippines and all the colony islands everywhere in that area? What about France and Napoleon? What about the Roman Empire conquering the entire world? What about the Mongols, overwhelming much of the Mideast and Europe. You need to study history: you apparently have no idea what has been going on, you just have a hate on against America. I suppose you must be a foreigner, maybe a Muslim.
4. You say we have killed more "innocent" civilians than any other country. You must never have learned any history whatsoever! The Romans killed MILLIONS, they simply depopulated every rebel area one by one with swords. The Congo now is up to some 4 million dead in the last few years. The Mongols regularly put entire cities to the sword if they resisted, 12,000 in Baghdad alone and built that famous pyramid of skulls. The Japanese killed fabulous numbers of Chinese before WWII in Manchuria; China and Cambodia killed amazing millions of their own citizens after WWII. Compared with the usual numbers killed in wars, we hardly kill anyone!
That said, I don't see bombing Syria as actually helping them out, somehow.
5. You are behind the times. You refer to "innocents," but there are no innocents anymore. That went out at the turn of the 19th-20th century. Probably way before, but for sure then. The idea now is depopulation. That's why the emphasis on poison gas and nuclear bombs, to depopulate the area that has enemies in it. I don't like it either, but if you don't even understand modern warfare, you can't think clearly about what is going on.